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// Copyright 2015 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/compiler/node-matchers.h" namespace v8 { namespace internal { namespace compiler { bool NodeMatcher::IsComparison() const { return IrOpcode::IsComparisonOpcode(opcode()); } BranchMatcher::BranchMatcher(Node* branch) : NodeMatcher(branch), if_true_(nullptr), if_false_(nullptr) { if (branch->opcode() != IrOpcode::kBranch) return; for (Node* use : branch->uses()) { if (use->opcode() == IrOpcode::kIfTrue) { DCHECK_NULL(if_true_); if_true_ = use; } else if (use->opcode() == IrOpcode::kIfFalse) { DCHECK_NULL(if_false_); if_false_ = use; } } } DiamondMatcher::DiamondMatcher(Node* merge) : NodeMatcher(merge), branch_(nullptr), if_true_(nullptr), if_false_(nullptr) { if (merge->InputCount() != 2) return; if (merge->opcode() != IrOpcode::kMerge) return; Node* input0 = merge->InputAt(0); if (input0->InputCount() != 1) return; Node* input1 = merge->InputAt(1); if (input1->InputCount() != 1) return; Node* branch = input0->InputAt(0); if (branch != input1->InputAt(0)) return; if (branch->opcode() != IrOpcode::kBranch) return; if (input0->opcode() == IrOpcode::kIfTrue && input1->opcode() == IrOpcode::kIfFalse) { branch_ = branch; if_true_ = input0; if_false_ = input1; } else if (input0->opcode() == IrOpcode::kIfFalse && input1->opcode() == IrOpcode::kIfTrue) { branch_ = branch; if_true_ = input1; if_false_ = input0; } } } // namespace compiler } // namespace internal } // namespace v8